Fast Proposal

At a country-club party a young man was introduced to an attractive girl. He immediately began paying her court and flattering her. The girl liked the young man, but she was taken a bit aback by his fast and ardent pitch. She was amazed when, after 30 minutes, he seriously proposed marriage.
"Look," she reacted.
"We only met a half hour ago. How can you be so sure? We know nothing about each other." "You're wrong," the young man replied. "For the past 5 years I've been working in the bank where your father has his account."